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authorSanto Cariotti <santo@dcariotti.me>2021-03-24 22:44:05 +0100
committerSanto Cariotti <santo@dcariotti.me>2021-03-24 22:44:05 +0100
commit2e73951013d33b2ef772ffe20a8242a4293d332e (patch)
treee4a856dff9857ccdfb570a196e76721b513766d6 /chapters
parenta0b3e5f8b5faf110f3ca9534a2e552896ce58297 (diff)
chapter5: fix typo and added sections
Diffstat (limited to 'chapters')
-rw-r--r--chapters/physic.tex35
1 files changed, 30 insertions, 5 deletions
diff --git a/chapters/physic.tex b/chapters/physic.tex
index 2521f4d..2725fd0 100644
--- a/chapters/physic.tex
+++ b/chapters/physic.tex
@@ -3,9 +3,9 @@ Qui di seguito è riportato il \verb|dump| in SQL per la creazione delle tabelle
CREATE TABLE "repository" (
id uuid PRIMARY KEY NOT NULL,
url varchar(255) UNIQUE NOT NULL,
- created_date timestamp NOT NULL,
- updated_date timestamp NOT NULL,
- uploader_ip varchar(15) NOT NULL
+ created_at timestamp NOT NULL DEFAULT NOW(),
+ updated_at timestamp NOT NULL DEFAULT NOW(),
+ uploader_ip varchar(21) NOT NULL
);
CREATE TABLE "email"(
@@ -17,7 +17,7 @@ CREATE TABLE "commit" (
hash varchar(40) PRIMARY KEY NOT NULL,
tree varchar(40) REFERENCES commit(hash) NULL,
text text NOT NULL,
- date timestamp NOT NULL,
+ date timestamptz NOT NULL,
author_email varchar(120) REFERENCES email(email) NOT NULL,
author_name varchar(120) NOT NULL,
committer_email varchar(120) REFERENCES email(email) NOT NULL,
@@ -31,4 +31,29 @@ CREATE TABLE "branch" (
repository_id uuid REFERENCES repository(id) NOT NULL,
head varchar(40) REFERENCES commit(hash) NULL
);
-\end{lstlisting} \ No newline at end of file
+\end{lstlisting}
+
+\section{Trigger}
+Qui di seguito si viene implementato un trigger che aggiorna automaticamente la data di \verb|updated_at| ogni qual volta si viene modificata una \verb|Repository|.
+\begin{lstlisting}[language=SQL]
+CREATE OR REPLACE FUNCTION update_repository_last_updates() RETURNS TRIGGER AS $$
+BEGIN
+ NEW."updated_at" = NOW();
+ RETURN NEW;
+END;
+$$ LANGUAGE PLPGSQL;
+
+CREATE TRIGGER update_repository_t BEFORE UPDATE ON repository
+FOR EACH ROW
+EXECUTE PROCEDURE update_repository_last_updates();
+\end{lstlisting}
+
+\section{Top authors}
+Lato client si sarebbero potuti esaminare i dati presi dai commit ma, per velocizzare il tutto lato client, ho preferito inserire una query lato server con un'endpoint per trovare la TOP 7 degli sviluppatori con più commit di cui sono autori. \textit{Ho preferito non considerare i committers perché, se presi da GitHub, automaticamente il committer sarà sempre noreply@github.com}.
+
+\begin{lstlisting}[language=SQL]
+SELECT COUNT(hash) as num, author_email, author_name
+FROM commit
+GROUP BY author_email, author_name
+ORDER BY COUNT(hash) DESC
+\end{lstlisting}